I have a 2000 Corolla LE, auto transmission, with 115,000 miles. I get a "groaning" noise from the car (engine/transaxle area?) when I start to accelerate (soft or hard) from a stop or while under way. This happens whether the car is cold or warmed up. The noise is only noticeable for a few seconds. The noise is not evident with transmission in P or N, and only, it seems, when the engine/transmission are under load (?). Any advice would be welcome. I bought the car new and all servicing is in accordance with...etc.